Precision-Polished Aspheric Lens, AR Coating T4: 1050-1700 nm OLS220136-T4
Spherical aberration makes standard spherical lenses unsuitable for large acceptance angles such as illumination collection. Aspheres maintain constant focal length or very high numerical aperture (NA) without multiple correcting elements, simplifying systems and reducing surface transmission loss and ghosts. Higher NA, larger apertures, and lower f/# suit collection, projection, inspection, fiber coupling, source collection, and focusing onto small fast detectors. Smaller diameters fit medical or portable equipment; larger ones fit benchtop analyzers. JCOPTIX precision-polished aspheres use N-BK7 or S-LAH64, both highly transparent from visible to NIR. S-LAH64 has higher index than N-BK7 and S-LAH64 is commonly used for high-NA short-focus lenses. CNC polishing and optimized parameters give on-axis diffraction-limited performance and minimize spherical aberration at large NA. Diameters range from 12.5 to 25 mm, with AR coatings on both sides for 350-700 nm, 650-1100 nm, or 1050-1700 nm, reducing average reflection below 0.5% per surface. Contact technical support for customization.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Optical element material | N-BK7 |
| Diameter | 25.0 mm |
| Clear Aperture (Collimation) | Ø23.0 mm |
| Clear Aperture (Focusing) | Ø22.0 mm |
| Operating Wavelength | 1050-1700 nm |
| Focal Length | 50.0 mm |
| f | 2 # |
| Numerical Aperture | 0.23 |
| Decentration | < 3 arcmin |
| Working Distance | 46.0 mm |
| Design Wavelength | 780 nm |
| Refractive Index | 1.517 |
| Center Thickness | 6.0 mm |
| Antireflection Coating R_avg [1050-1700 nm] | R_avg< 0.5% @ 1050-1700 nm |
| Curved surface fringe count (spherical surface) [RMS] | 3 Fringes (RMS) |
| Chamfer [45°] | 0.2 mm，45° |
| Focal Length Tolerance | ± 1% |
| Diameter Tolerance | +0.0/-0.1 mm |
| Thickness Tolerance | ± 0.1 mm |
| Aspheric Surface Figure Error | ±7.5 μm |
| Transmitted wavefront error [@633 nm] | < 500 nm |
| Surface quality (scratch/dig) | 60/40 |
Key Features
Datasheet
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